effect of water vapor and surface morphology on the low temperature response of metal oxide semiconductor gas sensors

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ID: 128688
2015
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Abstract
In this work the low temperature response of metal oxide semiconductor gas sensors is analyzed. Important characteristics of this low-temperature response are a pronounced selectivity to acid- and base-forming gases and a large disparity of response and recovery time constants which often leads to an integrator-type of gas response. We show that this kind of sensor performance is related to the trend of semiconductor gas sensors to adsorb water vapor in multi-layer form and that this ability is sensitively influenced by the surface morphology. In particular we show that surface roughness in the nanometer range enhances desorption of water from multi-layer adsorbates, enabling them to respond more swiftly to changes in the ambient humidity. Further experiments reveal that reactive gases, such as NO2 and NH3, which are easily absorbed in the water adsorbate layers, are more easily exchanged across the liquid/air interface when the humidity in the ambient air is high.
Reference Key
maier2015materialseffect Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Konrad Maier;Andreas Helwig;Gerhard Müller;Pascal Hille;Martin Eickhoff
Journal Nature Materials
Year 2015
DOI
10.3390/ma8095323
URL
http://www.mdpi.com/1996-1944/8/9/5323
Keywords
surface morphology sno2 electronics bet adsorptiontechnologyelectrical engineering

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